Hello, I've been making bath bombs for a few months and I'm looking to make them better. I'm wondering how much SLSA you guys add to your bombs. My current recipe includes 2 cups of baking soda, 1 cup citric acid. Then my oil, fragrance, color etc. I'm currently using 1 tbsp of SLSA but I want more foam and for them to last longer. I tried increasing it to 2 tbsp but it didn't seem to make a big difference. How much do you add to your recipe? I've added a picture of the result in hoping to achieve. Thanks in advance !!